package com.utils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.Hashtable;
/**
* @Description 二维码工具类
*/
public class QRCodeUtil {
/**
* @Description: 字符串转二维码, 二维码转base64
* @Param [contents:二维码内容, width:宽, height:高]
* @Return: java.lang.String
* 1.设置画板
* 2.读取文件转换为字节数组
* 3.将二维码转base64格式
**/
public static String RQCodeBase64(String contents, int width, int height) {
//1.设置画板
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//容错级别最高
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");//设置字符编码
hints.put(EncodeHintType.MARGIN, 1);//二维码空白区域,最小为0也有白边,只是很小,最小是6像素左右
try {
//2.读取文件转换为字节数组
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);
//ByteArrayOutputStream out = new ByteArrayOutputStream();
BufferedImage image = toBufferedImage(bitMatrix);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ImageIO.write(image, "png", outputStream);
//3.将二维码转base64格式
Base64.Encoder encoder = Base64.getEncoder();
String base64Img = encoder.encodeToString(outputStream.toByteArray());
String res = "";
res = "data:image/png;base64," + base64Img.toString();
return res;
//转换成png格式的IO流
//ImageIO.write(image, "png", response.getOutputStream());
//byte[] bytes = out.toByteArray();
2、将字节数组转为二进制
//BASE64Encoder encoder = new BASE64Encoder();
//binary = encoder.encodeBuffer(bytes).trim();
} catch (WriterException | IOException e) {
e.printStackTrace();
return null;
}
}
/**
* @Description: image流数据处理
* @Param [matrix]
* @Return: java.awt.image.BufferedImage
**/
private static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
return image;
}
}
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